[CI] Trigger pipeline deploy when versions.json changes (#134387)

.buildkite/pipelines/on_merge.yml

@@ -11,9 +11,23 @@ steps:
       automatic:
         - exit_status: '*'
           limit: 1
-
   - wait
 
+  - label: 'Triggering changes-based pipelines'
+    branches: main
+    agents:
+      queue: kibana-default
+    plugins:
+      - chronotc/monorepo-diff#v2.0.4:
+          watch:
+            - path:
+                - 'versions.json'
+              config:
+                command: 'node .buildkite/scripts/steps/trigger_pipeline.js kibana-buildkite-pipelines-deploy main'
+                label: 'Trigger pipeline deploy'
+                agents:
+                  queue: 'kibana-default'
+
   - command: .buildkite/scripts/steps/on_merge_build_and_metrics.sh
     label: Build Kibana Distribution and Plugins
     agents:

.buildkite/scripts/steps/es_snapshots/promote.sh

@@ -15,5 +15,5 @@ node "$(dirname "${0}")/promote_manifest.js" "$ES_SNAPSHOT_MANIFEST"
 
 if [[ "$BUILDKITE_BRANCH" == "main" ]]; then
   echo "--- Trigger agent packer cache pipeline"
-  node .buildkite/scripts/steps/trigger_packer_cache.js
+  node .buildkite/scripts/steps/trigger_pipeline.js kibana-agent-packer-cache main
 fi

.buildkite/scripts/steps/trigger_pipeline.js

@@ -8,12 +8,16 @@
 
 const { BuildkiteClient } = require('kibana-buildkite-library');
 
+const pipelineSlug = process.argv[2];
+const branch = process.argv[3] || 'main';
+const commit = process.argv[4] || 'HEAD';
+
 (async () => {
   try {
     const client = new BuildkiteClient();
-    const build = await client.triggerBuild('kibana-agent-packer-cache', {
-      commit: 'HEAD',
-      branch: 'main',
+    const build = await client.triggerBuild(pipelineSlug, {
+      commit,
+      branch,
       ignore_pipeline_branch_filters: true, // Required because of a Buildkite bug
     });
     console.log(`Triggered build: ${build.web_url}`);